Greenheck DG / DGX Industrial Space Heating (464044 IOM) (Pre-2009) - Manual (Page 8)

Installation - Direct Gas Piping
I - 6
From
Gas
Supply
Gas Cock
1/8 in. Plugged Tap
6 in. Trap
Ground Joint Union
Step 3 Connect the Supply Gas Line
A manual shut off valve (gas cock), 1/8 inch plugged
test port and 6 inch drip leg must be installed prior to
the gas train (see figure #12). The valve and the test
port must be accessible for the connection of a test
gauge. Supply gas connections must be made by a
qualified installer and are not furnished by Greenheck
Step 2 Install Additional Regulator if
Required
When the supply gas pressure exceeds the maximum
gas pressure shown on the direct gas nameplate (see
figure #11), an additional regulator (by others) is
required to reduce the pressure. The regulator must
have a listed leak limiting device or it must be vented
to the outdoors.
Step 4 Pipe the Optional Vent Line
If an optional vent line is located between the safety
shutoff valves it must be piped to the outdoors. Refer
to figure #13.
Step 5 Test the System for Leaks
Check both the supply lines and the factory piping for
leaks. Apply a soap and water solution to all piping
and watch for bubbling which indicates a leak.
WARNING!
The factory piping has been checked for leaks, but should be rechecked due to shipping and
installation.
WARNING!
NEVER test for a gas leak with an open flame.
NOTE!
The regulator located inside the unit is used to
adjust the unit’s maximum output temperature.
NOTE!
Reference the National Fuel Gas Code for
additional vent line requirements.
Safety Shut-off
Valves
Vent Line
Solenoid
To Burner
Vent Line
To Outdoors
From Supply
Space Heat Unit
Figure 12. Supply Gas Line
Figure 13.
Vent Line